TrueNAS Core 12.0-U1.1 install does not progress past 20 percent and spontaneously reboots

Hardware:
Supermicro X7DBE motherboard
Dual Intel Xeon E5310 (4-cores, 1.6 GHz stock, no HTT)
2x LSI MegaRAID SAS 6 Gbps RAID HBA
2x Samsung EVO 850 1 TB SATA 6 Gbps SSD connected to the SATA ports on the motherboard
6x HGST 3 TB SATA 3 Gbps 7200 rpm HDDs
Supermicro SC826TQ chassis. I don't remember the PSU wattage, but it is the variant that also has 7 LP slots.

I'm trying to do a fresh install of TrueNAS Core 12.0-U1.1 on my older server.

The system currently runs with the OS installed...

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